laboratory experiments

A bacteria in a laboratory experiment doubles every hour. What will be the population of bacteria after 7 hours, if the number of bacteria now is 58? => 7524 or 128 or 7424 or 7374..

Tanya was doing an experiment in a laboratory. She heated a solution from 30 o C to 80 o C . Find the change in the temperature. => 110 o C or - 50 o C or 60 o C or 50 o C..

In the laboratory, carbon dioxide is usually prepared by the action of dilute hydrochloric acid on marble chips. Marble chips are taken in a round-bottomed flask, as shown in figure 11.6. ..

Interference of sound waves can be demonstrated using Quincke's tube. It consists of two U-tubes ABCDE and FGH, whose limbs can be inserted telescopically into each other. The tube ABCDE is provided with two side tubes at B and D. The side tube at D is fitted with a rubber tube. A tuning fork of hi..

Henry performs a turbidity test in an Environmental Laboratory and records the results in his lab report. The standard deviation of his lab measurements is σ = 1.6 NTU (Naphlametric Turbidity Units). Henry repeats the measurement 5 times and records the mean x ‾ of his 5 mea..

Policy decisions are already taken in India to undertake technology developments for alternatives to CFCs. Two CSIR laboratories - National chemical laboratory and Indian Institute of Chemical technology are working on this. Along with this, parameters for design modifications s..

Gene Therapy - Gene therapy is a relatively new method of therapeutic interventions, targeted at the level of cellular gene expansion. In this, altering the diseased state is achieved by delivering nucleic acids into a cell. In gene therapy a normal functional gene is introduced into cells that con..

. Speciation may also be induced artificially, through animal husbandry or laboratory experiments..

Argon is used mainly to provide an inert atmosphere in high temperature metallurgical processes (arc welding of metals or alloys) and for filling electric bulbs. It is also used in the laboratory for handling substances that are air-sensitive. Helium is a non-flammable and light gas. Henc..

We know that there is water vapour in air. In other words, air contains moisture and so it is wet. This quality of wetness is referred to as humidity. For our physical comfort, humidity should not be too high or too low. Usually when the atmospheric temperature is high, more evaporation of water ta..